Order list on a numerical base

Question

i am using this code to order a list descending on numerical base

ItemsList.OrderByDescending(x => x.Views, new IntComparer());

public class IntComparer : IComparer<long>
{
    IComparer<long> Members;

    public int Compare(long x, long y)
    {
        return Math.Sign(x - y);
    }
}

but it doesn't order at all :S any help plz

Answer 1

Enumerable.OrderByDescending is part of LINQ.

So it is not modifying the list, but it is creating new one. Use

ItemsList = ItemsList.OrderByDescending(x => x.Views, new IntComparer()).ToList();

or something similiar.

Answer 2

You should read this : http://msdn.microsoft.com/fr-fr/library/bb534861.aspx#Y1185 It seems that this method doesn't update the list, so you need to store the result.

List aList = ItemsList.OrderByDescending(x => x.Views, new IntComparer());

public class IntComparer : IComparer<long>
{
    IComparer<int> Members;

    public int Compare(long x, long y)
    {
        return Math.Sign(x - y);
    }
}

ItemsList = aList;